The sidereal day begins _________

The sidereal day begins __________.

Question 1 / 2066636ee928f7522a1c51a0be

Question 1 of 2066636ee928f7522a1c51a0be

The sidereal day begins __________.

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Question 1 of 20

66636ee928f7522a1c51a0be

The sidereal day begins __________.

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🔍 Key Concepts

• Definition of a sidereal day compared to a solar day • Role of the first point of Aries in celestial navigation and timekeeping • Meaning of the reference meridian (usually Greenwich) in defining time scales

💭 Think About

• Ask yourself: what must line up with what in the sky and on Earth to mark the start of a sidereal day? • Which object or point is used as the reference in sidereal time: the Sun or a fixed star/first point of Aries? • Among the choices, which one clearly ties the first point of Aries to a specific meridian on Earth rather than a calendar date or longitude value?

✅ Before You Answer

• Verify which event actually defines 0h sidereal time in celestial navigation texts • Check whether sidereal time is based on the Sun or on a fixed reference point among the stars • Confirm that the correct option links the first point of Aries to the observer’s/reference meridian, not to a calendar date or arbitrary longitude like 180°

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Question 1 of 20

The sidereal day begins __________.

at 0000 on 1 January (Sidereal Date)

when the sun is over the first point of Aries

when the first point of Aries is over 180° longitude

when the first point of Aries is over the upper branch of the reference meridian

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Question 1 / 2066636ee928f7522a1c51a0be

Question 1 of 2066636ee928f7522a1c51a0be

The sidereal day begins __________.

Back

Question 1 of 20

66636ee928f7522a1c51a0be

The sidereal day begins __________.

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

Quick actions

— No credit card needed